Initial Release

flash/nuke/CMakeLists.txt

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+add_executable(flash_nuke
+        nuke.c
+        )
+
+target_link_libraries(flash_nuke
+        pico_stdlib
+        hardware_flash
+        )
+
+# It doesn't make sense to run this program from flash. Always build a
+# RAM-only binary.
+pico_set_binary_type(flash_nuke no_flash)
+
+pico_add_extra_outputs(flash_nuke)
+
+# add url via pico_set_program_url
+example_auto_set_url(flash_nuke)
+

flash/nuke/nuke.c

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+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+// Obliterate the contents of flash. This is a silly thing to do if you are
+// trying to run this program from flash, so you should really load and run
+// directly from SRAM. You can enable RAM-only builds for all targets by doing:
+//
+// cmake -DPICO_NO_FLASH=1 ..
+//
+// in your build directory. We've also forced no-flash builds for this app in
+// particular by adding:
+//
+// pico_set_binary_type(flash_nuke no_flash)
+//
+// To the CMakeLists.txt app for this file. Just to be sure, we can check the
+// define:
+#if !PICO_NO_FLASH
+#error "This example must be built to run from SRAM!"
+#endif
+
+#include "pico/stdlib.h"
+#include "hardware/flash.h"
+#include "pico/bootrom.h"
+
+int main() {
+    flash_range_erase(0, PICO_FLASH_SIZE_BYTES);
+    // Leave an eyecatcher pattern in the first page of flash so picotool can
+    // more easily check the size:
+    static const uint8_t eyecatcher[FLASH_PAGE_SIZE] = "NUKE";
+    flash_range_program(0, eyecatcher, FLASH_PAGE_SIZE);
+
+    // Flash LED for success
+    gpio_init(PICO_DEFAULT_LED_PIN);
+    gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
+    for (int i = 0; i < 3; ++i) {
+        gpio_put(PICO_DEFAULT_LED_PIN, 1);
+        sleep_ms(100);
+        gpio_put(PICO_DEFAULT_LED_PIN, 0);
+        sleep_ms(100);
+    }
+
+    // Pop back up as an MSD drive
+    reset_usb_boot(0, 0);
+}